src/mem/probes/mem_footprint.hh

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#ifndef __MEM_PROBES_MEM_FOOTPRINT_HH__
#define __MEM_PROBES_MEM_FOOTPRINT_HH__

#include <unordered_set>

#include "base/callback.hh"
#include "mem/packet.hh"
#include "mem/probes/base.hh"
#include "sim/stats.hh"
#include "sim/system.hh"

struct MemFootprintProbeParams;

/// Probe to track footprint of accessed memory
/// Two granularity of footprint measurement i.e. cache line and page
class MemFootprintProbe : public BaseMemProbe
{
  public:
    typedef std::unordered_set<Addr> AddrSet;

    MemFootprintProbe(const MemFootprintProbeParams &p);
    // Fix footprint tracking state on stat reset
    void statReset();

  protected:
    /// Cache Line size for footprint measurement (log2)
    const uint8_t cacheLineSizeLg2;
    /// Page size for footprint measurement (log2)
    const uint8_t pageSizeLg2;
    const uint64_t totalCacheLinesInMem;
    const uint64_t totalPagesInMem;

    void insertAddr(Addr addr, AddrSet *set, uint64_t limit);
    void handleRequest(const ProbePoints::PacketInfo &pkt_info) override;

    struct MemFootprintProbeStats : public Stats::Group
    {
        MemFootprintProbeStats(MemFootprintProbe *parent);

        /// Footprint at cache line size granularity
        Stats::Scalar cacheLine;
        /// Footprint at cache line size granularity, since simulation begin
        Stats::Scalar cacheLineTotal;
        /// Footprint at page granularity
        Stats::Scalar page;
        /// Footprint at page granularity, since simulation begin
        Stats::Scalar pageTotal;
    };

    // Addr set to track unique cache lines accessed
    AddrSet cacheLines;
    // Addr set to track unique cache lines accessed since simulation begin
    AddrSet cacheLinesAll;
    // Addr set to track unique pages accessed
    AddrSet pages;
    // Addr set to track unique pages accessed since simulation begin
    AddrSet pagesAll;
    System *system;

    MemFootprintProbeStats stats;
};

#endif  //__MEM_PROBES_MEM_FOOTPRINT_HH__